Update public FFmpeg header files from r16647 to r18286.

third_party/ffmpeg/include/libavutil/lzo.h

 /*
  * LZO 1x decompression
  * copyright (c) 2006 Reimar Doeffinger
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVUTIL_LZO_H
 #define AVUTIL_LZO_H
 
 #include <stdint.h>
 
-#define LZO_INPUT_DEPLETED 1
-#define LZO_OUTPUT_FULL 2
-#define LZO_INVALID_BACKPTR 4
-#define LZO_ERROR 8
+/** \defgroup errflags Error flags returned by av_lzo1x_decode
+  * \{ */
+//! end of the input buffer reached before decoding finished
+#define AV_LZO_INPUT_DEPLETED 1
+//! decoded data did not fit into output buffer
+#define AV_LZO_OUTPUT_FULL 2
+//! a reference to previously decoded data was wrong
+#define AV_LZO_INVALID_BACKPTR 4
+//! a non-specific error in the compressed bitstream
+#define AV_LZO_ERROR 8
+/** \} */
 
-#define LZO_INPUT_PADDING 8
-#define LZO_OUTPUT_PADDING 12
+#define AV_LZO_INPUT_PADDING 8
+#define AV_LZO_OUTPUT_PADDING 12
 
-int lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);
+/**
+ * \brief Decodes LZO 1x compressed data.
+ * \param out output buffer
+ * \param outlen size of output buffer, number of bytes left are returned here
+ * \param in input buffer
+ * \param inlen size of input buffer, number of bytes left are returned here
+ * \return 0 on success, otherwise a combination of the error flags above
+ *
+ * Make sure all buffers are appropriately padded, in must provide
+ * AV_LZO_INPUT_PADDING, out must provide AV_LZO_OUTPUT_PADDING additional bytes.
+ */
+int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen);
 
+/**
+ * \brief deliberately overlapping memcpy implementation
+ * \param dst destination buffer; must be padded with 12 additional bytes
+ * \param back how many bytes back we start (the initial size of the overlapping window)
+ * \param cnt number of bytes to copy, must be >= 0
+ *
+ * cnt > back is valid, this will copy the bytes we just copied,
+ * thus creating a repeating pattern with a period length of back.
+ */
 void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
 
 #endif /* AVUTIL_LZO_H */